Nebulizer



July 3, 1928. t 1 1,676,113

C. L. RILEY NEBULI ZER Filed NOV- 21, 1925 2 3% /////////%lllllllllll 'LZVTUR.

EILE

Patented July 3, 1928.

CHAMPLAIN L. RILEY, 0.? NORTH PLAINFIELD,

new JERSEY, assrenon TO mous- TRIAL ASSOCIATES, INCORPORATED, OF NEW YORK, N.'Y., A CORPORATION NEW YORK.

Newman Application filed November 21, 1925. Serial No. ?0,532.

My invention relates particularly type. My invention provides certainimprovements over the construction shown in my Patent 1,624,847, particularly with ref-' erence to (1) the centrifugal dispersion of the liquid, 2) the shaping of the rotor to minimize a hesion of solids, and (3) the mounting of the rotor on its'driving spindle.

0 In the accompanying drawin Fig. 1 is a side elevation partlally in section illustrating a nebulizer which incorporates my improvements; and

Fig. 2 is a plan view of the rotor alone. The presentnebulizer comprises .a rotor having a spherical hub axially pierced at 16 to freely accommodate the bolt 17 by which it is attachedto the driving s indle 18. A hemispherical seat 19 is provi ed at the end of the spindle to engage'the upper face of the hub 15, and a correspon mg hemispherical seat is provided, in the face of the washer 20 which and is supported by the nuts 21 at the lower end of the bolt 17. The spindle is driven at high speed- (say 5000 revolutions per minute) by any suitable means, such as a belt engaging the ulley 22 on the spindle.

Extending mm the hub 15 m its plane of rotation is a web 23, preferably integral therewith. Rigid with the web, and also preferably integral therewith, is a speed ring 24. In the form shown the ring is duplex and extends on both si es of the to nebulizers, and

verge toward. the axis of the rotor forming throw-off lips, the outer margins 32, 33, 0 which constitute sharp throw-off edges. Connecting'the latter is the peripheral surface 34 of the ring which is dished or .concaved for a purpose hereinafter explained.

The liquid to dispersed is led to the to nebulizers of centrifugal of the channels serving as dams which underlies the rotor' plane of'the web. 011 its inner facelg the the channel 26 until equal radial depth of liquid is attained therein. The radial depth of the liquid in the two flcliztnnels now increases steadily and equally as liquid continhas to feed through the nozzle 36, the walls revent the outward escape of theliquid. he

latter thus forms in effect two liquid annuli,

one on .each side of the web 23, both annuli rotating at high speed under the drag of the speed ring and web.

The rapidly rotating liquid annuli finally attain a radial dept sufiicient to over-flow the smooth crests 28 and 29 of the confining dams. The over-flow is at once dispersed outwardly by centrifugal force, and the liquid leaves the throw-oil edges of the speed rings at the speed of rotation acquired while detainedin the whirling liquid annuli, combined with the radial speed im arted thereto by the centrifugal throw-off. .depth of each sheet of liquid over-flowing the dam crests 28 and 29 is reduced as it fans out over the radially increasing area ofthe surfaces 30, 31. Consequently, the liquid reaches the throw-0d edges 32, 33 .in attenuated form, and is discharged therefromat exceedingly high s eed against the surrounding atmosphere. ot only the impact against the air wall, but the forces of disassociation incident to the high discharge Keed, cause the liquid to break into a very e nebula. spray drying, gas washing, air conditioning, etc. i

In spray dryin the solids, freed from their moisture an in very fine condition, tend to gather upon bodies with which they come in contact. In the nebulizer shown in m application above mentioned, the throw- 0.. lipsare located radially inward from the periphery of the rotor, with the result that This condition is ideal for when used for spray drying the solids tend I claimto gather on these peripheral surfaces. They 1. In a centrifugal atomizer, a driving i not gather Moreover,

not only add weight to the rotor, but they are apt to set up an-unbalanced condition which is hard on the bearings, and may even result in a wabbling action which endangers the rotor itself. In the present construction, the peripheral surface of the rotor or speed ring is concaved or dished and lies radially inward from the outer margins of the dispersing surfaces. The dispersed liquid is thrown outward entirely clear of the peripheral surfaces of the rotor, and the latter do solids to any substantial extent. the radial extent of the dispersing surfaces is reater than in my earlier construction, an a greater centrifugahofithrow speed is imparted to the particles of the dispersed liquid film. Again, the inclination of the centrifugal dispersing surfaces is such that the fluid is directed outwardly in planes which diverge from the plane of the rotor. This also tends to keep the solids away from the rotor and prevents deposition thereon.

The present construction thus adds to the advantage of a liquid rin rotating at high speed, and a centrifugal ischarge from its margins, as in my prior'application, the advantage of (1) a centrifugal off-throw surface of greater radial extent, (with resultant higher off-throw speed and greater attenuation of the liquid before discharge) (2) a discharge directed away. from the plane of rotation, and (3) a discharge at a point beyond the peripheral surface of the rotor.

From a structural standpoint the present,

simple to manufacture as and it has the advantage of a self-centering bearing connectin to a driving spindle. The nuts 21 are tig tened to such point that-the rotor can be moved only with difficulty, by hand. When rotating athigh speed however, centrifugal force causes the rotor to find its exact plane of rotation, while the friction exerted upon the hub 15 suflices to effect the drive.

While I have shown the construction which I regard as the best now known to me, various modifications will readily occur to those dealing with the I within the scope ofw invention.

rotor is quite as my earlier form,

at I claim as my ]problem, which fall spindle and a nebulizer unit suspended therefrom and having a frictional flexible joint drive engagement therewith.

2. In a centrifugal atomizer, a driving spindle having concave seat at one end, a nebulizer unit having a ball hub fitted to said seat and axially pierced, a cup member bearing a ainst the opposite face of said ball hub, an a clamping member passing through the axially pierced hub and engaging the spindle to secure the said parts together.

3. In a centrifugal atomizer, a driving spindle having concave seat at one end, a nebulizer unit having a ball hub fitted to said seat and axially pierced, a cup member bearing against the opposite face of said ball hub, and a clamping. member passing with clearance through the axially pierced hub and engaging the spindle to secure the said parts together.

4. n a centrifugal atomizer, a rotor comprising an annulus concave on its inner periphery to form a channel and concave on its outer periphery, the surfaces connecting the margins of said inner and outer periphery concave surfaces constituting throw-off lips, the peripheral margins of which project beyond the outer peripheral surface of the annulus.

5. In a centrifugal prising an annulus having end surfaces forming throw-ofi' lips and an outer peripheral surface connecting said .end surfaces, said outer peripheral surface being concave.

6. In a centrifugal atomizer, a rotor comprising an annulus having inner and outer peripheral surfaces and end surfaces connecting said peripheral surfaces, said end surfaces forming throw-ofl' lips, and said outer peripheral surface being concave.

7. In a centrifugal atomizer, a rotor comprising an annulus having inner and outer peripheral surfaces and'end surfaces connecting said peripheral surfaces, said end surfaces being convergent toward the axis and said outer peripheral surface being concave.

In testimony whereof I have signed my name to this s ecification.

(IHAMPLAIN L. RILEY.

atomizer, a rotor com- 

